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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c35cec9603abbd9559560d10cfa4c6df5bbd15539811cc1c6b1e03e43471b9e' 
  AND token = '9BU2mU5g+WnGG3HoWonb+K1Vm1ZRZPffazU247Mwzqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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