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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9237aab3510f16380e4120bcd8e3140d4c20d9b80193b16a2ee122f102064948' 
  AND token = 'WdD5f+ZH8N+foIpOfTEKbmzFiWdsNHbRSzVSLPxv8LU=' 
  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"
    }
  }
}