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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2ee3589ba886e5e93ecf5ff3625850a2d3754738a023ab76c8f4af72615dc8' 
  AND token = 'q+465XzkjyuWG+7SWHZTgXy69HyE6aIWSC3bMhwIHik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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