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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ac75b6c110e0d56533862591231df0d73938559701402a646b3707fc7ffe88' 
  AND token = 'lTtVo1oAGBb0vm5HbWFr7rRUCao8a8olF9LLUQQIyK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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