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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75e1c8d326cb8fd81ade63e7263ae512599e59e0af9ada5413ecdf677a6db9f7' 
  AND token = 'EQpvzJHHmYhdC6zf7kj2QroJ+Uok+Mk8PyQs2K6z2M8=' 
  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"
    }
  }
}