SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5154d2754842f3fc07111cc524b26820bee66ea53f77d5c7a11a2c34a51e5d81' 
  AND token = 'pRgyizppmJvlq0X9nRhuYYVq2ujbmldL+YsJwlxZrmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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