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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4921955d235efcd65e5ee427092de21a15833d7ceb7783294e794e4b16c66103' 
  AND token = 'O3En51CJxU0743xXQ/0VgY1657DsdsEcRhfvRJoDL7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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