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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e052ed264e725c605825fd902e5d47c41792bcad38eee4b0401a0a067b1acd' 
  AND token = 'C6JZn/++Ri3v1x4mBI/ev9YASCE4mk/pAJnDbsKJPVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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