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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6683b1bb00a5e67ebfa2666b007813c75c563646c2b8b5f7a0c453ca8f65bd1' 
  AND token = 'Rh4WOtW/bm8Uzr7RfdzvISB3BBQanz8Wv5SwfRvRO24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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