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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f337d749d25a70745466108084af8124620a81518057ada44e8eadc7b8ed37b' 
  AND token = '4sgfvRcOHuPQu0UpOXWsHA6P/ylUac1Mlo/owZp813Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00221

JSON explain

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