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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694b89756e306e8425666c52c43113dcc2727c2ebf114299b2fce84ecad17a48' 
  AND token = '8VLZCbvQjIkLZA4S36UKt0Qo1yLnJ24rJCaIhyGZHoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00152

JSON explain

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