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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71de7c80a970a780f6312dd8767451ed8c7dab0caebb501eb9fff29bd2aca980' 
  AND token = '4PxUnN6Zfi5jWA+4dePAJPCzgc1vD2t0H5k9UQ1ae/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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