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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80777d8fc90cee10113e63362c689e973527c22df95b4e43777e20148c57356' 
  AND token = 'tKu5ICHa9RVljc3IG1jvfS91XFNfe+HwSQWRDzZQn/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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