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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44865a6fb594d62215c0c0ed059e5f1bc845c5b77a15603d00dad1831649b40e' 
  AND token = '79xLgh1oa4ArPgTWyge9v7JERr/yk7f1EYmD9VBdpVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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