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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ed4bd72e3f4765299fd13b3076cbb87a8164f0e5d801d337bc4773ee00d22e' 
  AND token = 'fNY24Dj/zZ5B3ZI2Rr9BTQ/56XqQ2pZqsavSS4pGYOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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