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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682462f3710c5dc6f6962a4eeb8afce4fe88723531a8e9413c8757ff9edc7ee2' 
  AND token = '9VHGod06sJgtKa3OGzf2bfk9XHKq2hiKoD6Wk7T0fS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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