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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fde15c35acf412da1f3756b007d5f4b40c2bf9bbde5e91613268aeeb2a19f06' 
  AND token = '946OY/83fURlj8MoHWb4yNWJB/pmmgBxdEUGyL006J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00730

JSON explain

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