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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58837929c4fb01d09bdd9d707bee8b86c320fa52007b8e427c80c944916c16b9' 
  AND token = 'KCac+t/QnJC2nPRLpDpGkew9Xrw0xZU3261V5GuajWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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