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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a53655aaeb6c8bd9bbf195b547f5d1dbeed684313aaf2c31b8e9c632748c6e7' 
  AND token = 'QJxRMPYzzl3xEi65vNGjyNdzQ9bkDWRzMP7Ol9/cvNU=' 
  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"
    }
  }
}