SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2433b4c45e735502c7603d5b4359417aae5f1d9a7670f1c526626c5f84b73365' 
  AND token = 'HkcM+PHHQwDru9tPJIlBWG+lFUQ6E38pxmjmbVigJJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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