Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7de8ce33ae86b7fa9ce878a6fedfbd5d4135e0b5dd3c2014e876726af3fec0' 
  AND token = 'BPSG7VLdNUErckGj+/A3OEM6J9FPjiqEU3Qk5X5bd+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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