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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b676b80a208e6f1165ebee9a43f58e2c903daf9b6a421a20fb2f6715bd4f36' 
  AND token = '9ZrIvaUe/8+wOohC3TEBvkuMJM+3J6ABcPdnULW7mCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}