Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cd84236b4f43edcfbebc50427952fbca3b1f76cf1ee50e7192230271a222cb' 
  AND token = 'WWboJa7kEX9DjbQANUV2gungi2tR0FfSfLw8mBNlJCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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