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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0efd4a4b29e21e8a471e2105cb576c33e039b358a4c502237b30c54dd72ec5' 
  AND token = 'NMq1RJFpCcu+7mwnccHrPX+sJq2Lup+U0bbcmqKaAgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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