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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138be6c99ffb02152faf633a88d8f97a92f5ff8b23f85046da80f32c8ac75468' 
  AND token = 'Fnboni/eiWpTz08dbt9Rw3Tt12X3x7hY/IFqK3NOrH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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