Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd841a5a9df27d4db0a8dc0c06174e229cb1c24a933341c8721f32304158bbb1' 
  AND token = 'P9SQ8EpwXM501dAmnpuZ0h32ViWkr4mkPJ6rH2u04oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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