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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b4a9828fafd6a9a3360468a16fd3f539bd08f3bfd0972160d1b8dfc4c5e8fe' 
  AND token = '4o0HSxxeBUy5a6tlYitS4Gsc3xvMhIbqaiMERzglfuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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