SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced46e5da191234be4f394bcd41ab066f2caa319ae33452a7f6de4b45df1a8ad' 
  AND token = 'oGDof/+q2bb7QpjPSbw7iJHulg1hYd5h4KjVs+sxf98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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