SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f069e7ac02848fd5ffc9f9f7b496490aa521b90ad6e9ea82691bb4a331f7e52' 
  AND token = 'pReNFACm8J1Moz9lC+mioWX5s1VQh3/vZvqIvagQ7zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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