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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbfa4e0d8a317fc277c908017c93cbae3bdc67c21cbafa676a04992723342a5' 
  AND token = '271QSPA1XsKHfxu9BE2tmonLska1kJm98fCg7l8W7TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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