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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3dd6b22cc9db085515cabc57bff84bf72534e55aea32b584b3faed6f5abb4e' 
  AND token = 'S9AuOgmC8UACrvNmB5OlCg2f9nJ5ZQ8YOJULDj7I3Yk=' 
  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"
    }
  }
}