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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a515aac5f364080e7742f172e53c0a44f3fde8a6be196a692b147e7750e3ec' 
  AND token = '9TAtear2KKotWHWOy3ZruQjR+OzkAvcI4sODjkwHUXk=' 
  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"
    }
  }
}