SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101a7b5e03fabbd0871faddf5c9350d5e9bff284f596c9210b5e4f3dd439a48b' 
  AND token = 'NGLYb/kEgEwv7zm/4yjTx4pg51mF6vFXCGKMPXMjBDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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