SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9556974ac032c75392df8c5fd034f9fae3bda6e352be11bf88307ca27bb85ba' 
  AND token = '44yS8VIFMKE5U/Kx8nVDLuCOhFqYnSR6gJvmJf50PxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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