Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c813c3f2b92ee984046964906beb1d18f3200a1877846a84db6d549832e2085c' 
  AND token = 'gb9RTBSZOWHi8Ym+7T/Kj2g3dem4yfU1Zwbjy+S3EZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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