Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ddeefeb9c97a27cc6767db9b5744196ff227ec3b326debd798d385c9bebd69' 
  AND token = '7UQ2SBDMi8Jc4tZyyPm0TSggIRC5MZTy5F23+OMJnwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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