Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44936713135cc756fcbd72e3948a0a422aedec85abdcfbe5e96f2a457b9bde8' 
  AND token = 'z6h3a/rN/RSqdlWvR2YgBbfAsb/C5qD+7WU778K8/Lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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