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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad287663a54b3b953562d7536d30c61e2b46bf002b3462e5b8be63ac6a34dc44' 
  AND token = 'WDAw76rbLQPn3xHWdStc7A2USFjuT+gZmmk3j8qJLtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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