Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e794d3cfd6e3b594e609597de57bbea70664afb74a82f0e8f68447772cf0467' 
  AND token = 'eP1GauSfK1smmM2FTFlSvCF+KiQngeb2GBEpl1WM1T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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