SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aaf78f98166aca3551fde34e0969c64ae23f264c32f450a1e50420e5f46965d' 
  AND token = 'CMvl0PSaYh9Fq/Z4JQnB7OK0qT2HPyULgGX55BtgBZc=' 
  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"
    }
  }
}