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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92212b7684a4249d950f88e8a3b15837a53b0a4229c117b44b88fa49c4ec0c2' 
  AND token = 'GdpNKJeO/dg+eaXtUuA1XHwhfwAd0WR+4Kqp4c/Z2CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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