Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4ebccd23812553410597d45df53ca839771eecd7c34cecb58802d74c87f14c' 
  AND token = 'xFD3Q1FwUCsCbAT6TFw7qnWKk8aykwdGv7z2ASg2sAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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