Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f6e5be9f285ff9c0c1af7ac79b34794b3c49e9ae79f2407a462a4ede35e58b' 
  AND token = '+3EY8Kirslh/h3Gxj16pXt5E2oFwGdGihgt4lY2uUo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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