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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d82d68ff0d4c7617c3b3815701a5ec8c97979cd22be099facf893b270827d9' 
  AND token = 'MfTPsGaKKC4gOWYSixh4Gndvuh6d6va6sR4WIU9jX6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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