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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3f9e0c0957abca18d154bb7cdb0e1eb4eda386db638f80ea932d914f3327c1' 
  AND token = 'ZgO+Wl5qtER4d525QGxPoHGXfB8WGdExfevUFWXgLjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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