SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a972526103083fdc66f839722ae0a53317fbe3c71b571f2922b635c0c8c9f745' 
  AND token = 'RgBxOA9KMGPRRlotN8Zj0/uCRMUQrDqjrPkhB5JhmII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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