SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50caa501a1ad8a19bbf5f76d5beb50e24a2f1cfd47831928c161797beac775af' 
  AND token = 'aBGtZgkdAKg9RGxHYh5OwJ6MZuAhdxDopDZ7L23qv9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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