SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c736bff591fcb6d088516da18791106a82c3e53db36960320e44430bc8431d19' 
  AND token = 'JruUjM8Uvg60zo/sHnwFVwA/MpyajoG2a8sRZMS2rPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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