Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf457390c6f30cdc8d6fe5a0436ad5204cc53d970ebebc0b3f8001f2dff73b14' 
  AND token = 'vTIUtAfnhcNoWZeP4uUtIbBUV0ALr7V0LtZRiShyiZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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