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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad9c014486dfab0b51ac5341394cab6cbc31f5c3ff4124dcdca6b9f7cea276a' 
  AND token = '6mmps0nTUDojIQza8KcPl5qfFC1zIiiu1f8idSy5GKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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