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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a33c5780e520bf57ff8eb3b52c96d60ca608092232c57d3f7b6f42873b4322' 
  AND token = '3/my0FK6vQHnWIqviSCn75XfOWlQHAyzV29l/gK5GgU=' 
  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"
    }
  }
}