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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ed654b5d8bc83d80ebda2b6c67007c19f61130cbcec89260cebb4254359263' 
  AND token = 'aWpB6jmiWXp+tsOht+zgQ13TXx/9r9yAUtbZSxVEXU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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