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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ec472f4faa2dd29fdb3cd8ea0a5bbde61b6bbf677df8ad24d1fb150745fff7' 
  AND token = 'QprLRI2k5bRLTE8GtJ2F7sY6/kDvEzuAnx1Bpyd15Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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