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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98771aaea62630b5b7cb34646e57d1da77c9c4dca463500b2eef4070d26eb41f' 
  AND token = '5aNcfbKhwt6uHajJ2WYaDUvrxNqtocHMIAqzfOfeymk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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