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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cff5b1cd164b52bba3ef5ea2f7f8c4ad7b06d442f906792bfebfe7d419c3bf2' 
  AND token = 'Gp56n1BoBtdjEPVN5WQI2LyP8SusoZ5v+gw2wQswPx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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