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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99aed96c671439482f87270bae5af2a37443914c9d22f6bfae39dc75743db025' 
  AND token = 'tgdy9XSVupYp+2Vu/yyXbfnp1tmGX0yDCT/k6izNCy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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