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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d3859147a9d0dbbf4204c7de81e1a63873de0022b38bf7cea879fd791e3361' 
  AND token = 'iL/giFyag9NWPnCPEM+RFnn7z0NVf+n6a2yR4/uijvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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