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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0c9cd44b099dc8dec97e1b5fe5da06ca17bd581bd4e5a738d1e73354119d6c' 
  AND token = 'pVMNNCPMb8S0xoq8DJ6v33sgq2oRgyPcMiCpetNz/y4=' 
  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"
    }
  }
}