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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df4b4d49ec2ed8d128e96d5a34a4d59e69424556ce60c679c9818e2cc95158b' 
  AND token = 'qJqTrJhz5Tm017aE0CbTtFDdnHFlDNjTX4kIQUU6yFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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