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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddf70a4d4cec09f14d659b17e7eee6c0ccaaf3070eccca412528e2ed9b8ee37' 
  AND token = 'bQY+kfdtAkFa5akPqR9UL6dgyljlf2ATUvnRQMYZVHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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