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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fdb15e99b081b1e0e2d516072d4cb8629827f61dee226e9fc316e067dfe112c' 
  AND token = 'Pbp7PeRlOGwk8aXTP67Zsan6qh2RZxwD2qm02IHVtyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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