Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1f4956211b14716d77893b04477fdf7498007aa9a27ac8dc0fe7310d4e0e58' 
  AND token = 'pGcWtPvzFZjXAnPNlE+ynaCoso1Jkq07xD18C2ZBGTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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